Detachable spring-tooth harrow point



April 1932- H A. STEINER 1,853,706

DETACHABLE .SPRING TOOTH HARROW POINT Filed Dec. 24, 1950 //f/Y/?) A STEM/ER,

stares; PATENTOFJFICE HENRY A. STEINER, 0F CHILTON, \K I'ISCONSIN DETACHA'BLE SPRING-TOOTH HARROW POINT Application filed December 24,1930. Serial No. 504,561.

The present invention relates to adetach able harrow tooth for land cultivators, and it resides in an improved construction of harrow tooth and a special form of clamp uni-- tarily associated therewith, the clamp bemg adapted to secure a detachable harrow tooth in operating position upon a broken or worn out original spring tooth, or other suitable support, carried on the frame of the harrow.

The clamp is permanently afiixed to the detachable harrow tooth, and the movable adjusting elements are associated with the clamp in such manner as to prevent their accidental disengagemen't therefrom. As a result, no disarrangement or loss of the parts can occur in any handling of the same, in consequence of which the unitary structure embracing the several parts will be available in completely assembled form and always ready for immediate use whenever desired.

Each harrow tooth has attached to it two spaced ears, which are provided with aligned perforations, the purpose of the latter being to receive and afford permanent anchorage for a floating cross bar carrying the threaded clamping screw, by the pressure of which the harrow tooth is held in its effective operative position.

One end of the cross bar may be disengaged from the perforation in the cooperating car, so as to enable the other end of the cross bar to pivot in the opposite ear, and open a passage to permit the clamp to be passed about the broken or worn out original tooth, or

other element of the frame, upon which the detachable tooth is to be mounted. The cross bar is then restored to engaging position in the perforations in both ears, in which position the detachable tooth may be clamped firmly to its support.

Having thus outlined the nature and purposes of my invention, I will now describe the illustrated specific construction of the same,

and will point out the novelty thereof in the appended claims.

In the accompanying drawings:

Figure 1 is a perspective view showing one of the frame members of any usual harrow, and has attached thereto a broken or worn out spring tooth, to which latter is attached a double pointed detachable harrow tooth having attached thereto an improved clamp, accordingto my invention;

Fig.;.2 is a sectional view on the horizontal dotted line 22, Fig. 1, showing more clearly .the details ofconstruction and Fig. 3 is a view in rear elevation of the clamp and a fragment of the harrow tooth to which'it is permanently attached.

Tnthe drawings, the numeral 10 indicates one of the cross bars of anordinary harrow, which latter may be either of the wheel or skid type. Attachedto the cross bar, by one end, is a curved, spring tooth 11, the other end of which has-been broken or worn away, as indicated at 12.

To avoid the necessity and expense of re placing the broken or worn spring tooth .11 by another one .of the same kind, I apply thereto a detachable tooth 13, preferably, but not necessarily, pointed alike at both ends. The detachable teeth can easily be made from [steel strip stock of-uniform width, with a 1y approximating the length of the'said rec tangular openings. The cross bar 18, may be stamped sheet metal, or produced as a diecasting or a forging. The ends of the cross bar are shaped to form hooks 19 and 20, and when the cross bar is passed into the openings 16 and 17, the hooked ends of the cross bar will protrude at the outer sides of the ears, and the said hooks will engage the portion of the ears overlying the said openings, so as to anchor the cross bar against longitudinal movement. The hook 520 has a slightly greater length than the width of thecross bar, so that its projecting ends will engage the outer side of the ear 15at the ends of the opening 17, and prevent the cross bar from passing farther than is desired into the said openings. A set screw 21 is threaded into a perforation centrally located in the cross bar, and when the said set screw is there positioned, the cross bar can be disengaged only from the ear 14, as neither the said projecting ends nor the screw can be passed through the opening17.

WVhen the set screw 21 is sufficiently retracted, the hook end 19 of the cross bar 18 may be withdrawn from its engagement in the opening 16 of the ear 1%, by moving the cross bar longitudinally in the opening 17 of the ear 15, sufliciently to clear the hook end 19 of the cross bar from such engagement. Thereupon, the cross bar can pivot in the ear 15, by turning against the portion of the ear overlying the opening 17, and so be turned into the dotted line position shown in Fig. The gap or opening thus provided will permit the detachable tooth to be passed into the channel defined by the detachable harrow tooth and its attached ears. The cross bar may then be restored to its clamping position by engaging the hook end 19 in the opening 16 of the ear 1%, as shown in Fig. 2, and by turning up the set screw-21 until its point bears against the original spring tooth 11, or other support, the detachable barrow tooth will be clamped and held firmly in its operative position.

The double pointed detachable harrow tooth may be reversed when desired, and easily removed for grindingwhen dulled, by loosening the set screw 21, and partially withdrawing the cross bar 18, asbefore described. The enlarged or widened stub end 12 of the worn or broken original spring tooth 11, prevents the application of the detachable tooth 13, except by lateral entry into the channel of the clamp. It the points of the detachable tooth 13 are of greater width than the intermediate section, the ears 14 and 15 can be produced as integral parts of the detachable tooth, without the creation of a disproportionate amount of scrap. However, production of the demountable tooth and its attached ears in the manner illustrated, is preferable on account of the reduction in the number and cost of the blanking dies required.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, is:

1. A detachable harrow tooth having upon its rear side two permanently fixed spaced ears to constitute a channel, the said ears being provided with aligned openings, a cross bar with an engaging hook at each end disposed in the said openings, and a set screw possed through the said cross bar, to clamp the harrow tooth to a supporting member disposed in the channel.

2. A detachable harrow toothhaving upon its rear side two permanently fixed spaced ears to constitute a channel, the said ears being provided with aligned openings, a cross bar with an engaging hook at each end disposed in the said openings, one end of the cross bar projecting beyond the ends of the opening in the corresponding ear to limit the movement of the cross bar, and-a set screw passed through the said cross bar, to clamp the harrow tooth to a supporting member disposed in the channel;

3. A detachable harrow tooth having upon its rear side two permanently fixed spaced ears-to constitute achannel, the said ears being provided with aligned openings, a cross bar disposed in the said openings, one end of the cross bar removably engaged in theopening in one ear, and having a pivotal engagement in the opening in the other ear, and a set screw passed through the said crossbar, to clamp the harrow tooth to a supporting member disposed in the channel.

t. A detachable harrow tooth having upon its rear side two permanently fixed spaced ears to constitute a channel, the said ears being provided with aligned openings, a cross bar provided with a hook at each end disposed in the said openings, one such hook end removably engaged in the opening in one ear, and the other hook end having a pivotal engagement in the other ear, whereby the cross bar may be partially withdrawn to open the channel, and a set screw passed through the said cross bar, to clamp the harrow tooth to a supporting member inserted in the channel.

In testimony whereof, I have signedv my name at Milwaukee, this 12thday of December, 1930.

H. A. STEINER. 

